TechCrunch switched to Facebook's new commenting system a week ago. Now they're taking a look at what it has done to their comments:
Since we flipped the switch on for Facebook Comments last Tuesday morning, you’ve probably noticed that the overall number of comments have fallen dramatically. This is completely expected and definitely not a bad thing. Previously, many of our posts would get hundreds of comments (and sometimes more), but at least half of those would be of a quality best described as weak to poor. And of those, about half would be pure trollish nonsense.
Simply put: with the previous system, roughly half of the comments were more or less useless.[...]But the other interesting thing we’re seeing is that whereas trollish garbage used to infest the comment section, now we’re seeing almost the opposite. Many people are now leaving comments that gush about the subject of the article in an overly sycophantic way. It’s quite odd. The cold pricklies have turned to warm fuzzies.